INCOME TAXES: (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Current:
Federal	$ (676)	$ (782)
State and local	16	(104)
Current Income Tax Expense (Benefit)	(660)	(886)
Deferred:
Federal	(1,387)	(235)
State and local	(85)	554
Deferred Income Tax Expense (Benefit)	(1,472)	319
Total benefit for income taxes	$ (2,132)	$ (567)